Hi Steve,
No problem at all.
Regarding Excel: I don't use Excel, because I prefer to program. However, if you go to www.mrexcel.com, you can probably get an answer on creating a dynamic LIFO stack in Excel. I had used them in the past when I created an Excel spreadsheet as a stop-gap when I hit what I thought was a programming deadend. I received some answers. Also, if you are willing to pay a few bucks you can probably get a whiz-kid to do it for you completely at www.rentacoder.com. Just post what you're looking for and someone will probably bid for the work.
Your friend,
Matt